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* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.sshd.common.config.keys;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.Serializable;
import java.io.StreamCorruptedException;
import java.nio.file.Path;
import java.security.GeneralSecurityException;
import java.security.PublicKey;
import java.security.spec.InvalidKeySpecException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.NavigableMap;
import java.util.Objects;
import java.util.TreeMap;
import org.apache.sshd.common.keyprovider.KeyTypeIndicator;
import org.apache.sshd.common.session.SessionContext;
import org.apache.sshd.common.util.GenericUtils;
import org.apache.sshd.common.util.NumberUtils;
import org.apache.sshd.common.util.ValidateUtils;
import org.apache.sshd.common.util.io.PathUtils;
/**
*
* Represents a {@link PublicKey} whose data is formatted according to the
* OpenSSH format:
*
*
*
* <key-type> <base64-encoded-public-key-data>
*
*
* @author Apache MINA SSHD Project
*/
public class PublicKeyEntry implements Serializable, KeyTypeIndicator {
/**
* Character used to denote a comment line in the keys file
*/
public static final char COMMENT_CHAR = '#';
/**
* Standard folder name used by OpenSSH to hold key files
*/
public static final String STD_KEYFILE_FOLDER_NAME = ".ssh";
/**
* Standard suffix for SSH public key files
*/
public static final String PUBKEY_FILE_SUFFIX = ".pub";
private static final long serialVersionUID = -585506072687602760L;
private static final NavigableMap KEY_DATA_RESOLVERS
= new TreeMap<>(String.CASE_INSENSITIVE_ORDER);
private String keyType;
private byte[] keyData;
private PublicKeyEntryDataResolver keyDataResolver = PublicKeyEntryDataResolver.DEFAULT;
public PublicKeyEntry() {
super();
}
public PublicKeyEntry(String keyType, byte... keyData) {
this.keyType = keyType;
this.keyData = keyData;
}
@Override
public String getKeyType() {
return keyType;
}
public void setKeyType(String value) {
this.keyType = value;
}
public byte[] getKeyData() {
return keyData;
}
public void setKeyData(byte[] value) {
this.keyData = value;
}
public PublicKeyEntryDataResolver getKeyDataResolver() {
return keyDataResolver;
}
public void setKeyDataResolver(PublicKeyEntryDataResolver keyDataResolver) {
this.keyDataResolver = keyDataResolver;
}
/**
* If a {@link PublicKeyEntryDataResolver} has been set, then uses it - otherwise uses the
* {@link PublicKeyEntryDataResolver#DEFAULT default one}.
*
* @return The resolved instance
*/
public PublicKeyEntryDataResolver resolvePublicKeyEntryDataResolver() {
PublicKeyEntryDataResolver resolver = getKeyDataResolver();
return (resolver == null) ? PublicKeyEntryDataResolver.DEFAULT : resolver;
}
/**
* @param session The {@link SessionContext} for invoking this load command - may be {@code null}
* if not invoked within a session context (e.g., offline tool or session unknown).
* @param headers Any headers that may have been available when data was read
* @param fallbackResolver The {@link PublicKeyEntryResolver} to consult if none of the built-in ones can
* be used. If {@code null} and no built-in resolver can be used then an
* {@link InvalidKeySpecException} is thrown.
* @return The resolved {@link PublicKey} - or {@code null} if could not be resolved.
* Note: may be called only after key type and data bytes have been set or
* exception(s) may be thrown
* @throws IOException If failed to decode the key
* @throws GeneralSecurityException If failed to generate the key
*/
public PublicKey resolvePublicKey(
SessionContext session, Map headers, PublicKeyEntryResolver fallbackResolver)
throws IOException, GeneralSecurityException {
String kt = getKeyType();
PublicKeyEntryResolver decoder = KeyUtils.getPublicKeyEntryDecoder(kt);
if (decoder == null) {
decoder = fallbackResolver;
}
if (decoder == null) {
throw new InvalidKeySpecException("No decoder available for key type=" + kt);
}
return decoder.resolve(session, kt, getKeyData(), headers);
}
/**
* @param session The {@link SessionContext} for invoking this command - may be {@code null} if
* not invoked within a session context (e.g., offline tool or session unknown).
* @param sb The {@link Appendable} instance to encode the data into
* @param fallbackResolver The {@link PublicKeyEntryResolver} to consult if none of the built-in ones can
* be used. If {@code null} and no built-in resolver can be used then an
* {@link InvalidKeySpecException} is thrown.
* @return The {@link PublicKey} or {@code null} if could not resolve it
* @throws IOException If failed to decode/encode the key
* @throws GeneralSecurityException If failed to generate the key
* @see #resolvePublicKey(SessionContext, Map, PublicKeyEntryResolver)
*/
public PublicKey appendPublicKey(
SessionContext session, Appendable sb, PublicKeyEntryResolver fallbackResolver)
throws IOException, GeneralSecurityException {
PublicKey key = resolvePublicKey(session, Collections.emptyMap(), fallbackResolver);
if (key != null) {
appendPublicKeyEntry(sb, key, resolvePublicKeyEntryDataResolver());
}
return key;
}
@Override
public int hashCode() {
return Objects.hashCode(getKeyType()) + Arrays.hashCode(getKeyData());
}
/*
* In case some derived class wants to define some "extended" equality without having to repeat this code
*/
protected boolean isEquivalent(PublicKeyEntry e) {
if (this == e) {
return true;
}
return Objects.equals(getKeyType(), e.getKeyType())
&& Arrays.equals(getKeyData(), e.getKeyData());
}
@Override
public boolean equals(Object obj) {
if (obj == null) {
return false;
}
if (this == obj) {
return true;
}
if (getClass() != obj.getClass()) {
return false;
}
return isEquivalent((PublicKeyEntry) obj);
}
@Override
public String toString() {
PublicKeyEntryDataResolver resolver = resolvePublicKeyEntryDataResolver();
String encData = resolver.encodeEntryKeyData(getKeyData());
return getKeyType() + " " + (GenericUtils.isEmpty(encData) ? "" : encData);
}
/**
* @param session The {@link SessionContext} for invoking this command - may be {@code null} if
* not invoked within a session context (e.g., offline tool or session unknown).
* @param entries The entries to convert - ignored if {@code null}/empty
* @param fallbackResolver The {@link PublicKeyEntryResolver} to consult if none of the built-in ones can
* be used. If {@code null} and no built-in resolver can be used then an
* {@link InvalidKeySpecException} is thrown.
* @return The {@link List} of all {@link PublicKey}-s that have been resolved
* @throws IOException If failed to decode the key data
* @throws GeneralSecurityException If failed to generate the {@link PublicKey} from the decoded data
* @see #resolvePublicKey(SessionContext, Map, PublicKeyEntryResolver)
*/
public static List resolvePublicKeyEntries(
SessionContext session, Collection entries, PublicKeyEntryResolver fallbackResolver)
throws IOException, GeneralSecurityException {
int numEntries = GenericUtils.size(entries);
if (numEntries <= 0) {
return Collections.emptyList();
}
List keys = new ArrayList<>(numEntries);
for (PublicKeyEntry e : entries) {
Map headers = (e instanceof AuthorizedKeyEntry)
? ((AuthorizedKeyEntry) e).getLoginOptions()
: Collections.emptyMap();
PublicKey k = e.resolvePublicKey(session, headers, fallbackResolver);
if (k != null) {
keys.add(k);
}
}
return keys;
}
/**
* Registers a specialized decoder for the public key entry data bytes instead of the
* {@link PublicKeyEntryDataResolver#DEFAULT default} one.
*
* @param keyType The key-type value (case insensitive) that will trigger the usage of this decoder - e.g.,
* "ssh-rsa", "pgp-sign-dss", etc.
* @param resolver The decoder to use
*/
public static void registerKeyDataEntryResolver(String keyType, PublicKeyEntryDataResolver resolver) {
ValidateUtils.checkNotNullAndNotEmpty(keyType, "No key type provided");
Objects.requireNonNull(resolver, "No resolver provided");
synchronized (KEY_DATA_RESOLVERS) {
KEY_DATA_RESOLVERS.put(keyType, resolver);
}
}
/**
* @param keyType The key-type value (case insensitive) that may have been previously
* {@link #registerKeyDataEntryResolver(String, PublicKeyEntryDataResolver) registered} - e.g.,
* "ssh-rsa", "pgp-sign-dss", etc.
* @return The registered resolver instance - {@code null} if none was registered
*/
public static PublicKeyEntryDataResolver getKeyDataEntryResolver(String keyType) {
keyType = ValidateUtils.checkNotNullAndNotEmpty(keyType, "No key type provided");
synchronized (KEY_DATA_RESOLVERS) {
return KEY_DATA_RESOLVERS.get(keyType);
}
}
/**
* @param keyType The key-type value (case insensitive) that may have been previously
* {@link #registerKeyDataEntryResolver(String, PublicKeyEntryDataResolver) registered} - e.g.,
* "ssh-rsa", "pgp-sign-dss", etc.
* @return The un-registered resolver instance - {@code null} if none was registered
*/
public static PublicKeyEntryDataResolver unregisterKeyDataEntryResolver(String keyType) {
keyType = ValidateUtils.checkNotNullAndNotEmpty(keyType, "No key type provided");
synchronized (KEY_DATA_RESOLVERS) {
return KEY_DATA_RESOLVERS.remove(keyType);
}
}
/**
* @param keyType keyType The key-type value (case insensitive) whose data is to be resolved - e.g.,
* "ssh-rsa", "pgp-sign-dss", etc.
* @return If a specific resolver has been previously
* {@link #registerKeyDataEntryResolver(String, PublicKeyEntryDataResolver) registered} then uses
* it, otherwise the {@link PublicKeyEntryDataResolver#DEFAULT default} one.
*/
public static PublicKeyEntryDataResolver resolveKeyDataEntryResolver(String keyType) {
keyType = ValidateUtils.checkNotNullAndNotEmpty(keyType, "No key type provided");
PublicKeyEntryDataResolver resolver = getKeyDataEntryResolver(keyType);
if (resolver != null) {
return resolver; // debug breakpoint
}
return PublicKeyEntryDataResolver.DEFAULT;
}
/**
* @return A snapshot of the currently registered specialized {@link PublicKeyEntryDataResolver}-s, where key=the
* key-type value (case insensitive) - e.g., "ssh-rsa", "pgp-sign-dss", etc.,
* value=the associated {@link PublicKeyEntryDataResolver} for the key type
*/
public static NavigableMap getRegisteredKeyDataEntryResolvers() {
NavigableMap decoders;
synchronized (KEY_DATA_RESOLVERS) {
if (KEY_DATA_RESOLVERS.isEmpty()) {
return Collections.emptyNavigableMap();
}
decoders = new TreeMap<>(KEY_DATA_RESOLVERS.comparator());
decoders.putAll(KEY_DATA_RESOLVERS);
}
return decoders;
}
/**
* @param encData Assumed to contain at least {@code key-type base64-data} (anything beyond the
* BASE64 data is ignored) - ignored if {@code null}/empty
* @return A {@link PublicKeyEntry} or {@code null} if no data
* @throws IllegalArgumentException if bad format found
* @see #parsePublicKeyEntry(String, PublicKeyEntryDataResolver)
*/
public static PublicKeyEntry parsePublicKeyEntry(String encData) throws IllegalArgumentException {
return parsePublicKeyEntry(encData, (PublicKeyEntryDataResolver) null);
}
/**
* @param encData Assumed to contain at least {@code key-type base64-data} (anything beyond the
* BASE64 data is ignored) - ignored if {@code null}/empty
* @param decoder The {@link PublicKeyEntryDataResolver} to use in order to decode the key data
* string into its bytes - if {@code null} then one is automatically
* {@link #resolveKeyDataEntryResolver(String) resolved}
* @return A {@link PublicKeyEntry} or {@code null} if no data
* @throws IllegalArgumentException if bad format found
* @see #parsePublicKeyEntry(PublicKeyEntry, String, PublicKeyEntryDataResolver)
*/
public static PublicKeyEntry parsePublicKeyEntry(
String encData, PublicKeyEntryDataResolver decoder)
throws IllegalArgumentException {
String data = GenericUtils.replaceWhitespaceAndTrim(encData);
if (GenericUtils.isEmpty(data)) {
return null;
} else {
return parsePublicKeyEntry(new PublicKeyEntry(), data, decoder);
}
}
/**
* @param The generic entry type
* @param entry The {@link PublicKeyEntry} whose contents are to be updated - ignored if
* {@code null}
* @param encData Assumed to contain at least {@code key-type base64-data} (anything beyond the
* BASE64 data is ignored) - ignored if {@code null}/empty
* @return The updated entry instance
* @throws IllegalArgumentException if bad format found
* @see #parsePublicKeyEntry(PublicKeyEntry, String, PublicKeyEntryDataResolver)
*/
public static E parsePublicKeyEntry(E entry, String encData)
throws IllegalArgumentException {
return parsePublicKeyEntry(entry, encData, null);
}
/**
* @param The generic entry type
* @param entry The {@link PublicKeyEntry} whose contents are to be updated - ignored if
* {@code null}
* @param encData Assumed to contain at least {@code key-type base64-data} (anything beyond the
* BASE64 data is ignored) - ignored if {@code null}/empty
* @param decoder The {@link PublicKeyEntryDataResolver} to use in order to decode the key data
* string into its bytes - if {@code null} then one is automatically
* {@link #resolveKeyDataEntryResolver(String) resolved}
* @return The updated entry instance
* @throws IllegalArgumentException if bad format found
*/
public static E parsePublicKeyEntry(
E entry, String encData, PublicKeyEntryDataResolver decoder)
throws IllegalArgumentException {
String data = GenericUtils.replaceWhitespaceAndTrim(encData);
if (GenericUtils.isEmpty(data) || (entry == null)) {
return entry;
}
int startPos = data.indexOf(' ');
if (startPos <= 0) {
throw new IllegalArgumentException("Bad format (no key data delimiter): " + data);
}
int endPos = data.indexOf(' ', startPos + 1);
if (endPos <= startPos) { // OK if no continuation beyond the encoded key data
endPos = data.length();
}
String keyType = data.substring(0, startPos);
if (decoder == null) {
decoder = resolveKeyDataEntryResolver(keyType);
}
String b64Data = data.substring(startPos + 1, endPos).trim();
byte[] keyData = decoder.decodeEntryKeyData(b64Data);
if (NumberUtils.isEmpty(keyData)) {
throw new IllegalArgumentException("Bad format (no BASE64 key data): " + data);
}
entry.setKeyType(keyType);
entry.setKeyDataResolver(decoder);
entry.setKeyData(keyData);
return entry;
}
/**
* @param key The {@link PublicKey}
* @return The {@code OpenSSH} encoded data
* @throws IllegalArgumentException If failed to encode
* @see #toString(PublicKey, PublicKeyEntryDataResolver)
*/
public static String toString(PublicKey key) throws IllegalArgumentException {
return toString(key, null);
}
/**
* @param key The {@link PublicKey}
* @param encoder The {@link PublicKeyEntryDataResolver} to use in order to encode the key data
* bytes into a string representation - if {@code null} then one is automatically
* {@link #resolveKeyDataEntryResolver(String) resolved}
* @return The {@code OpenSSH} encoded data
* @throws IllegalArgumentException If failed to encode
* @see #appendPublicKeyEntry(Appendable, PublicKey, PublicKeyEntryDataResolver)
*/
public static String toString(
PublicKey key, PublicKeyEntryDataResolver encoder)
throws IllegalArgumentException {
try {
return appendPublicKeyEntry(new StringBuilder(Byte.MAX_VALUE), key, encoder).toString();
} catch (IOException e) {
throw new IllegalArgumentException("Failed (" + e.getClass().getSimpleName() + ") to encode: " + e.getMessage(), e);
}
}
/**
* Encodes a public key data the same way as the {@link #parsePublicKeyEntry(String)} expects it
*
* @param The generic appendable class
* @param sb The {@link Appendable} instance to encode the data into
* @param key The {@link PublicKey} - ignored if {@code null}
* @return The updated appendable instance
* @throws IOException If failed to append the data
* @see #appendPublicKeyEntry(Appendable, PublicKey, PublicKeyEntryDataResolver)
*/
public static A appendPublicKeyEntry(A sb, PublicKey key) throws IOException {
return appendPublicKeyEntry(sb, key, null);
}
/**
* @param The generic appendable class
* @param sb The {@link Appendable} instance to encode the data into
* @param key The {@link PublicKey} - ignored if {@code null}
* @param encoder The {@link PublicKeyEntryDataResolver} to use in order to encode the key data bytes into a
* string representation - if {@code null} then one is automatically
* {@link #resolveKeyDataEntryResolver(String) resolved}
* @return The updated appendable instance
* @throws IOException If failed to append the data
*/
public static A appendPublicKeyEntry(
A sb, PublicKey key, PublicKeyEntryDataResolver encoder)
throws IOException {
if (key == null) {
return sb;
}
@SuppressWarnings("unchecked")
PublicKeyEntryDecoder decoder
= (PublicKeyEntryDecoder) KeyUtils.getPublicKeyEntryDecoder(key);
if (decoder == null) {
throw new StreamCorruptedException("Cannot retrieve decoder for key=" + key.getAlgorithm());
}
try (ByteArrayOutputStream s = new ByteArrayOutputStream(Byte.MAX_VALUE)) {
String keyType = decoder.encodePublicKey(s, key);
byte[] bytes = s.toByteArray();
if (encoder == null) {
encoder = resolveKeyDataEntryResolver(keyType);
}
String encData = encoder.encodeEntryKeyData(bytes);
sb.append(keyType).append(' ').append(encData);
}
return sb;
}
private static final class LazyDefaultKeysFolderHolder {
private static final Path PATH = PathUtils.getUserHomeFolder().resolve(STD_KEYFILE_FOLDER_NAME);
private LazyDefaultKeysFolderHolder() {
throw new UnsupportedOperationException("No instance allowed");
}
}
/**
* @return The default OpenSSH folder used to hold key files - e.g., {@code known_hosts}, {@code authorized_keys},
* etc.
*/
@SuppressWarnings("synthetic-access")
public static Path getDefaultKeysFolderPath() {
return LazyDefaultKeysFolderHolder.PATH;
}
}
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